Process for the manufacture of artificial stone.



UNITED STATES PATENT OFFICE.

HEINRICH DRESLER, OF CREUZTHAL, GERMANY, ASSIGNOR TO COLN-MUSENER BERGWERKS AGTIEN VEREIN, OF CREUZTHAL, GERMANY, A CORPORATION OF GERMANY.

PROCESS FOR THE HANUFAGI'UBE OF ARTIFICIAL STONE.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed February 14- 1908- Serial No. 301.041-

, To all whom it may concern:

Be it known that I,- HEINRICH DaEsLEa, director of the Coln-Mfisener Bergwerks Ac tien Verein, of Creuzthal, Westphalia, German a subject of theGerman Emperor,and

resi ent of Creuzthal, Westphalia, Germany, have invented a new and useful Process for the Manufacture of Artificial Stone, Blocks, Pi es, Briquets, and the Like, of which the f0 owing is a specification.

This invention relates to arocess for manufacturing artificial stone, locks and pipes as well as briquets of various kinds by means of ground slag.

The process according to this invention differs from previous processes of similar kind by the fact that the finished product is submitted to carbonic acid or to gases containing carbonic acid under pressure at the ordinary temperature. This results in the process being greatly' 'implified, as the manufacturer becomes independent of boiler in stallations, and. all losses through radiation of heat are avoided.

The slag (for instance blast furnace slag) is ground, mixed with water, with: or without the addition of lime, pressed .into molds and then kept for a considerable time (several hours) under pressure of carbonic acid or gas mixtures containing carbonic acid, whereupon very strong stone material of elegant' appearance is obtained.

- Suitable gas mixtures containing carbonic acid are often available in technical working in large quantities, for instance, as waste gases from lime kilns, coke furnaces, boiler. furnaces and other furnace installations, generators and the like, and more particularly as burned or unburned blast furnace gases. These gases can be drawn off and forced by means of a compressor into the setting vessel or boiler. The pressure is preferably increased to several atmospheres.

The slag can be reviousl anulated in water or air or can e solidi e from a fluid state. When it is desired to convert into briquets, ores, dust from blast furnace charges and the like, these substances are mixed with finely ground slag, with or without addition of lime and blocks or other structures are formed and treated as just described. If blast furnace gases are allowed to act without compression the process takes a correspondingly longer time.

Having now particularlv described and ascertained the nature of this said invention, and in whatmanner the same is to be performed, I declare that what I claim is:

1. The process of manufacturing artificial stone, which consists in grinding slag, mixing it with waterypressingit, and then subjecting it for a considerable time to the action of carbonic acid gas under pressure at the ordinary temperature substantially as described.

' 2. The process of manufacturing stone,

which consists in grinding slag, mixing it with lime and water, pressing the mixture into'molds, and then subjecting the same to carbonic acid gas under ressure for a considerable time atthe orr inary temperature, substantially as described.

In testimony, that I claim the foregoing as my invention, I have signed my name in resence of two witnesses, this 30th day of anuary, 1906.

HEINRICH DRESLER.

Witnesses:

Bnssrn F. DUNLAP, R. H. DUNLAP. 

